My friend and I are planning to do a collaboration adoptable thread based around a certain theme, but we aren't completely sure if it is allowed? It would be both of our own designs and drawings on the same thread to help with the workload and we both believe it would be best to use the single thread instead of two threads since we are going to be both working on the same concepts.
I don't know if collaborated threads were against one of lioden's rules or not and would just like to double check if anyone else found evidence pointing to no.

we are thinking it would be okay since all adopts will be sold on the same thread, thus not advertising to each other's own separate threads. another reason we're putting towards yes is the fact that bases are usable with credit which is technically in a way a collaboration

but again we both aren't 100% sure if we can do this or not and would like some insight / help!